Noise Estimation in Magnitude MR Datasets

Date
2009-10-01
Authors
Maitra, Ranjan
Faden, David
Major Professor
Advisor
Committee Member
Journal Title
Journal ISSN
Volume Title
Publisher
Altmetrics
Authors
Research Projects
Organizational Units
Statistics
Organizational Unit
Journal Issue
Series
Department
Statistics
Abstract

Estimating the noise parameter in magnitude magnetic resonance (MR) images is important in a wide range of applications. We propose an automatic noise estimation method that does not rely on a substantial proportion of voxels being from the background. Specifically, we model the magnitude of the observed signal as a mixture of Rice distributions with common noise parameter. The Expectation-Maximization (EM) algorithm is used to estimate the parameters, including the common noise parameter. The algorithm needs initializing values for which we provide some strategies that work well. The number of components in the mixture model also need to be estimated en route to noise estimation and we provide a novel approach to doing so. Our methodology performs very well on a range of simulation experiments and physical phantom data. Finally, the methodology is demonstrated on four clinical datasets.

Comments

This is a manuscript of an article from IEEE Transactions on Medical Imaging 28 (2009): 1615, doi: 10.1109/TMI.2009.2024415. Posted with permission. Copyright 2009 IEEE.

Description
Keywords
Citation
DOI
Collections